Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!zaphod.mps.ohio-state.edu!rpi!uupsi!sunic!nuug!sigyn.idt.unit.no!ugle.unit.no!hanche From: hanche@imf.unit.no (Harald Hanche-Olsen) Newsgroups: comp.sys.apollo Subject: Re: 10K power supply problem Message-ID: Date: 12 Dec 90 18:18:52 GMT References: <9012070028.AA04240@wolf.Uwyo.EDU> <101020016@hpcvlx.cv.hp.com> Sender: news@ugle.unit.no Organization: The Norwegian Institute of Technology, Trondheim, Norway. Lines: 21 In-Reply-To: tomg@hpcvlx.cv.hp.com's message of 10 Dec 90 22:19:50 GMT In article <101020016@hpcvlx.cv.hp.com> tomg@hpcvlx.cv.hp.com (Thomas J. Gilg) writes: > Yes, we have seen that. Someone may find our cure for the problem > amusing: Just removing one of the 5V so-called booster modules cured > the problem. I've also heard that there are two schemes for the power supply "Bricks". In one scheme, _one_ brick acts as the master, and all the others as slaves. Only the master needs to have a correct output to drive the others. In some cases, swapping bricks will cure the problem. The part about masters and slaves was unknown to me. But I neglected to ention that we also tried removing another brick and put the one first removed back in, and the machine still ran without a problem. Only with all modules present does it shut off (after about twenty minutes or so). - Harald Hanche-Olsen Division of Mathematical Sciences The Norwegian Institute of Technology N-7034 Trondheim, NORWAY